Patent GB-475418-A (GB)
Title: Use of contact masses
IPC: B01J8/02
Filed: 1936-05-18
Abstract: In catalytic processes wherein the catalyst is alternately used for effecting the reaction and then regenerated in situ, e.g. by means of oxygen-containing gases, the catalytic mass is purged between the reaction and regeneration steps by evacuation, which is preferably rendered effective simultaneously and to the same extent at a number of points distributed uniformly throughout the mass.  If desired, the mass may also be evacuated after the regeneration process.  The vacuum may be applied, e.g. by means of steam injectors and may be assisted by condensation of the material removed from the mass. Multiple stage condensation of the recovered material may be used <PICT:0475418/IV/1> to recover high boiling and low boiling constituents separately. The process may be operated continuously by suitable arrangement of a number of converters, as shown in the Figure.  One converter 8 is fed with the materials to be treated via feed line 3, heat-exchanger 3a (for heat exchange with converted products passing to fractionator 5), and heater 6, while the other converter is fed with suitable gases for regeneration from line 9. Prior to regeneration this converter is evacuated by means of a barometic condenser 12, water admitted by pipe 13 being used to condense the evacuated vapour, the condensate being washed down into separating well 15, the oil from which is added to the main body of reaction product for treatment in the fractionator 5. Uncondensed gases are removed from the condenser 12 by evacuator 19.  The converter 8 preferably contain a number of perforated distributing and outlet conduits, e.g. as described in Specification 414,779, [Group III], embedded in the contact mass. In an alternative arrangement (not shown) the converter is evacuated by means of a surface condenser at about 225--250 DEG  F. to condense the heavier vapours and a second condenser operated at normal temperatures to condense the lighter vapours, a steam jet being interposed between the condensers to provide the necessary suction.  The condensates may be removed or returned to the main bulk of the reaction products as above.  The process may be applied to the polymerization of hydrocarbon gases, the treatment of heavy naphtha to improve its anti-knock value, the refining of motor fuels, the transformation of hydrocarbon residues and distillates, and suitable catalysts include activated hydrosilicate of alumina, with or without other metals and oxides as described in Specification 416,025, [Group III].ALSO:<PICT:0475418/III/1> In catalytic processes wherein the catalyst is alternately used for effecting the reaction and then regenerated in situ, e.g. by means of oxygen-containing gases, the catalytic mass is purged between the reaction and regeneration steps by evacuation, which is preferably rendered effective simultaneously and to the same extent at a number of points distributed uniformly throughout the mass.  If desired, the mass may also be evacuated after the regeneration process.  The vacuum may be applied, e.g. by means of steam injectors and may be assisted by condensation of the material removed from the mass.  Multiple stage condensation of the recovered material may be used to recover high boiling and low boiling constituents separately.  The process may be operated continuously by suitable arrangement of a number of converters, as shown in the Figure.  One converter 8 is fed with the materials to be treated via feed line 3, heat exchanger 3a (for heat exchange with converted products passing to fractionator 5), and heater 6, while the other converter is fed with suitable gases for regeneration from line 9.  Prior to regeneration this converter is evacuated by means of a barometic condenser 12, water admitted by pipe 13 being used to condense the evacuated vapour, the condensate being washed down into separating well 15, the oil from which is added to the main body of reaction product for treatment in the fractionator 5.  Uncondensed gases are removed from the condenser 12 by evacuator 19.  The converters 8 preferably contain a number of perforated distributing and outlet conduits, e.g. as described in Specification 414,779, embedded in the contact mass.  In an alternative arrangement (not shown), the converter is evacuated by means of a surface condenser at about 225--250 DEG  F., to condense the heavier vapours and a second condenser operated at normal temperatures to condense the lighter vapours, a steam jet being interposed between the condensers to provide the necessary suction.  The condensates may be removed or returned to the main bulk of the reaction products as above.  The process may be applied to the polymerization of hydrocarbon gases, the treatment of heavy naphtha to improve its anti-knock value, the refining of motor fuels, the transformation of hydrocarbon residues and distillates and suitable catalysts include activated hydrosilicate of alumina, with or without other metals and oxides as described in Specification 416,025.